gpio: mxs: use devres for irq generic chip

Use resource managed variants of irq_alloc_generic_chip() and
irq_setup_generic_chip().
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-mxs.c

@@ -66,6 +66,7 @@ struct mxs_gpio_port {
 	int irq;
 	struct irq_domain *domain;
 	struct gpio_chip gc;
+	struct device *dev;
 	enum mxs_gpio_id devid;
 	u32 both_edges;
 };
@@ -209,8 +210,9 @@ static int mxs_gpio_init_gc(struct mxs_gpio_port *port, int irq_base)
 {
 	struct irq_chip_generic *gc;
 	struct irq_chip_type *ct;
+	int rv;
 
-	gc = irq_alloc_generic_chip("gpio-mxs", 2, irq_base,
+	gc = devm_irq_alloc_generic_chip(port->dev, "gpio-mxs", 2, irq_base,
 					 port->base, handle_level_irq);
 	if (!gc)
 		return -ENOMEM;
@@ -242,10 +244,11 @@ static int mxs_gpio_init_gc(struct mxs_gpio_port *port, int irq_base)
 	ct->regs.disable = PINCTRL_IRQEN(port) + MXS_CLR;
 	ct->handler = handle_level_irq;
 
-	irq_setup_generic_chip(gc, IRQ_MSK(32), IRQ_GC_INIT_NESTED_LOCK,
+	rv = devm_irq_setup_generic_chip(port->dev, gc, IRQ_MSK(32),
+					 IRQ_GC_INIT_NESTED_LOCK,
 					 IRQ_NOREQUEST, 0);
 
-	return 0;
+	return rv;
 }
 
 static int mxs_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
@@ -304,6 +307,7 @@ static int mxs_gpio_probe(struct platform_device *pdev)
 	if (port->id < 0)
 		return port->id;
 	port->devid = (enum mxs_gpio_id) of_id->data;
+	port->dev = &pdev->dev;
 	port->irq = platform_get_irq(pdev, 0);
 	if (port->irq < 0)
 		return port->irq;